Inspeção e Teste de Eixo Rotativo e Rolamento - Guia Completo

INSPECTING AND TESTING A ROTARY SHAFT AND BEARING UNIT SLEEVE Right or left hand Shaft or bearing unit side LOCK SCREW FOR INNER RING SHAFT SIDE LOCK SCREW FOR OUTER RING HOUSING SIDE The two screws are designated lock screws and are located opposite each other Adjust the lock screws to prevent the bearing from loosening in use but do not overtighten or stop screws The lock screw usually has a strong steel indefinite thread If a lock screw is not available a special screw is inserted to prevent loosening of the bearing INSPECTING BEARING The bearing concerned with the position of the shaft or housing must be inspected immediately after mounting to detect any slight loosening before the bearing is damaged It is preferable to detect any loosening during use by feeling the vibrations Such a device is usually provided by means of a circle gauge The gauge may not detect very slight looseness which can often be felt as vibrations When mounting with a sleeve the bearing can loosen on the sleeve and the sleeve can loosen on the shaft For ease of maintenance tightening nuts or lock screws are provided When mounting on the shaft make sure that the bearing position is correct before locking the bearing in place and tightening lock screws INSPECTING THE SLEEVE Set a dial gauge to check the sleeve surface Slightly loosen the tightening collar and move the sleeve gradually in the direction of the arrow and find the position where the dial bar shows the maximum dial reading Keep the sleeve position and tighten the screws of the moving collar to the specified values in the table INSPECTING THE DIAL COVER Set the dial gauge so that the dial bar touches the outer ring of the bearing Rotate the shaft through less than one revolution to see if the dial reading varies A varying dial reading means the bearing is mount outofround or the shaft work is outofround Check the outer ring fastened position or the shaft runout